Shifter spring compressor

[dmaxweb]

Just working on the same thing myself. I was concerned about the spring popping out of the vise jaws. So, I used a piece of all thread, two fender washers, and two nuts compressed to 2-3/4".

Now, what size safety should be used and can the wire be twisted with a common pliers or do I need a safety wire pliers to get it tight?